93. The diligent student refused the help of others and insisted on working out the difficult maths problem _____.
| A．on his own | B．in his own | C．of his own | D．for his own |
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93. The diligent student refused the help of others and insisted on working out the difficult maths problem _____.
| A．on his own | B．in his own | C．of his own | D．for his own |
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